Sodium potassium pump in neuronal membranes is
(1) Responsible for transfer of 3 sodium outwards and two potassium inwards
(2) Responsible for 2 sodium outwards and three potassium inwards
(3) Responsible for 2 sodium and three potassium inwards
(4) Responsible for 2 sodium and three potassium outwards
The resting axonal membrane of a neuron:
1. is not polarized
2. has an excess of anions on the outside
3. is more permeable to potassium ions than to sodium ions
4. cannot be excited by a stimulus
During the process of impulse conduction, the depolarisation of axon takes place because
1. Voltage gated channels open
2. Equal amounts of and are pumped out
3. Voltage gated channels open
4. Equal amounts of and K are pumped in
Nerve impulse travelling through synapses cannot be
(1) Excitatory
(2) Inhibitory
(3) Both A and B
(4) Apolar neuronic
Which of the following event can be related to the repolarisation of nerve fiber?
1. Opening up of K+ gated channel
2. Opening up of Cl- gated channel
3. Closure of Na+ gated channel
4. Both 1 & 3
Depolarization of axolemma during nerve conduction takes place because of:
1. | Equal amount of Na+ & K+ moves out across axolemma |
2. | Na+ ions move inside |
3. | More Na+ ions are outside |
4. | None of the above |
The "sodium-potassium pump" pumps ______.
1. sodium ions out and potassium ions in
2. sodium ions in and potassium ions out
3. sodium and potassium ions in
4. sodium and potassium ions out
Match each item in Column I with one item in Column II and choose your answer from the codes given below:
Column I |
Column II |
||
I. |
Influx of sodium |
1. |
Original establishment of RMP |
II. |
Efflux of potassium |
2. |
Repolarization |
III. |
Na+/K+ pump |
3. |
Depolarization |
IV. |
Ca++ |
4. |
Plateau in cardiac muscles |
Codes :
I |
II |
III |
IV |
|
1. |
3 |
2 |
4 |
1 |
2. |
2 |
1 |
4 |
3 |
3. |
2 |
1 |
3 |
4 |
4. |
3 |
2 |
1 |
4 |
The depolarization of the axonal membrane is due to:
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of the potassium ions
During the propagation of a nerve impulse, the action potential results from the movement of
1. K+ ions from extracelular fluid to intracellular fluid
2. Na+ ions from intracellular fluid to extracellular fluid
3. K+ ions from intracellular fluid to extracellular fluid
4. Na+ ions from extracellular fluid to intracellular fluid